Yellow stain is removed by either scaling or bleaching which depends upon your tooth condition.
Brush properly 2 times daily. Rinse your mouth. If you get food impaction between teeth, use floss.
Take care of your oral hygine.

Hello.
When brushing twice a day and flossing doesn't help improve your yellow teeth, it's time to consider other options. Teeth become yellow due to stains – both deep and surface-level – as well as other causes that sometimes aren't under our control. Although coffee and cigarettes leave stains on your teeth over time, thin tooth enamel also makes teeth look yellow. Tooth enamel is the hard, white surface of your teeth, and underneath it is a pale brown substance called dentin. Thick enamel looks white, but thin enamel allows dentin tones to show through, making teeth look yellow from the outside. Enamel naturally wears thin as people age, but acids from foods and drinks such as sour candies, oranges and soda also thin the enamel by eroding its surface. Saliva neutralizes acid and washes it away, but people suffering from dry mouth miss out on this protective effect. Other causes of yellow teeth include antibiotic use or excessive fluoride intake in young children, which can cause yellow-stained adult teeth later. Treatments for certain conditions can also affect tooth color. For example, head and neck radiation and chemotherapy can cause teeth discoloration. In addition, certain infections in pregnant mothers can cause tooth discoloration in the infant by affecting enamel development. Certain medication, mouth rinses can also causes yellow staining.
Preventing Yellow Teeth:
Avoiding smoking, coffee and soda helps prevent yellow teeth, or you can get into the habit of drinking those darker beverages through a straw. Drink milk or plain water after eating or drinking something acidic to help reduce the acid's eroding effect. Brushing and flossing also help, and avoiding snacks between meals allows your saliva to dilute the acids in your mouth too.
Using over-the-counter whitening agents will also helps.
Discolorations are generally responsive to bleaching procedures.
**********Do visit a dentist*****

Yellow teeth might be due to deposits of plaque and tartar on teeth. Go for scaling and polishing of teeth. If further whiteness is required, you can also go for bleaching.

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